We adopt a simplified kinetic scheme to account for the functional dependence of the observed, rapid dissociation of I2in the presence of O2(1&Dgr;). Phenomenologically, the functional form for I2disappearance was found to bed[I2]/dt=−[(6±4)×10−29cm6 s−1][I2][O2(1&Dgr;)]2for O2(1&Dgr;) concentrations greater than 25 mTorr. Moreover, analysis of our data indicates that three O2(1&Dgr;) molecules are expended in producing two iodine atoms.